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Tachyarrhythmias Patient information factsheet Tachyarrythmias (fast heart rhythms) This factsheet has been written to help you understand more about heart rhythm problems. If there is anything you do not understand, or you would like more information, please ask a member of your healthcare team, who will be happy to explain further. To help you understand this factsheet please refer to our “how the heart works” factsheet first. This is available on: www.uhs.nhs.uk or ask a member of your healthcare team. What is an arrhythmia? Arrhythmia is the term used to describe heart rhythm abnormalities. Sometimes if the heart’s conduction pathway is damaged, blocked, or an extra pathway exists the heart’s rhythm changes. The heart may beat: • too quickly (tachycardia) • too slowly (bradycardia) • irregularly. This may affect the heart’s ability to pump blood around the body. Arrhythmias can occur in the heart’s upper chambers (atria) or lower chambers (ventricles). Causes of an arrhythmia Any interruption in the heart’s electrical system can cause an arrhythmia. Common causes of arrhythmias include stress, caffeine, tobacco, alcohol, diet pills and cough and cold medicines. If your heart tissue is damaged as a result of acquired heart disease, such as myocardial infarction (heart attack) or congenital heart disease you may be at risk of developing arrhythmias. Occasionally it may be an inherited disorder or one that runs in your family. Sometimes it is not possible to identify the cause of the arrhythmia. Diagnosing your arrhythmia If your doctor suspects that you may have an arrhythmia, one or more of the following tests may be performed to determine the cause of your symptoms. Electrocardiogram (ECG) An electrocardiogram is a recording of the electrical activity of your heart. Electrode stickers are placed on your chest and connected by wires to a recording machine. Your heart’s electrical signals produce a pattern on graph paper in the ECG. By analysing the pattern of these waves, your doctor can often determine what type of arrhythmia you have. ECG testing may be done while you are resting, or while you are exercising on a treadmill. www.uhs.nhs.uk Patient information factsheet Holter monitor A Holter monitor shows changes in your heart rhythm over the course of a 24-hour period that may not be detected during a resting or exercise ECG. You will be asked to go about your daily activities as usual (except for showering or bathing) while you wear a small, portable recorder that connects to electrode stickers on your chest. You will then come back to the hospital the next day so that the information can be retrieved and analysed. Cardiac event monitor If your doctor feels you need to be monitored for several days or weeks, you may need to have a cardiac event monitor. This type of recording device is used if your arrhythmias are infrequent. This device is about the size of a large pager, and can be clipped to your belt or waistband or carried in your bag or pocket. When you feel symptoms, you simply hold the recorder against your chest and press a button. The device then records up to 70 seconds of ECG readings. Internal loop recorder (ILR) Your doctor may feel an ILR is appropriate to investigate your symptoms. This is a long-term continuous heart monitor placed under the skin on the chest wall. The ILR comes with an activator, when you have symptoms you place the activator over the ILR and it will store your heart rhythm during your symptoms. If you have potential life-threatening arrhythmias your device will transmit this data automatically to the hospital. The ILR is inserted under local anaesthetic and the battery can last for more than three years. Once the battery has expired the device is usually removed. Types of arrhythmia Arrhythmias that occur in the atria are either ‘atrial’ (in the heart’s upper chambers) or ‘supraventricular’ (above the ventricles) in origin, whereas ventricular arrhythmias start in the ventricles (lower chambers). While some arrhythmias are merely a nuisance, others can be life-threatening. In general, ventricular arrhythmias caused by heart disease are the most serious kind, and require prompt medical attention. Supraventricular tachycardia (SVT) This type of arrhythmia commonly occurs in young, healthy people. Doctors often refer to SVT as ‘re-entry tachycardia’. This is because the electrical impulse does not fade out as with the normal heartbeat, but continues to move in a rapid circle within the conduction system. This is due to an extra electrical pathway that can form a short circuit within the heart’s conduction system. SVT is usually a rapid, regular rhythm. The two most common types of SVT are: • AV-nodal re-entry tachycardia • AV re-entry tachycardia (AVRT), most commonly known as Wolff-Parkinson-White syndrome (WPW). AV nodal re-entry tachycardia (AVNRT) This type of arrhythmia occurs when a problem arises in the way the electrical impulses pass through the AV node. Normally, the AV node acts as a gateway, slowing and regulating the impulses as they travel between the atria and the ventricles. In AVNRT there are two pathways, known as dual conduction pathways that can pass impulses to and from the AV node. This type of arrhythmia usually starts following an early beat (ectopic). An electrical short circuit then occurs where the electrical impulse rotates around the circuit and with each cycle pass to the ventricles, resulting in a very fast heartbeat. www.uhs.nhs.uk Patient information factsheet AV re-entry tachycardia (AVRT) or Wolff-Parkinson-White syndrome (WPW) In AVRT an extra electrical pathway exists that bypasses the normal conduction system. The pathway directly connects the atria to the ventricles. This extra pathway is known as an accessory pathway. The electrical impulses travel along the accessory pathway, bypassing the AV node. The tissue in the pathway does not slow the impulse down, as in the AV node. Therefore the electrical impulses reach the ventricles before the normal electrical impulse (this is known as pre-excitation). An ECG recording of a patient with WPW syndrome will often show a ‘delta wave’, which shows the existence of an extra electrical pathway. Very fast heart rates may occur as the electrical impulse bounces between the atria and ventricles. Atrial fibrillation Atrial fibrillation (AF) is one of the most common types of arrhythmia.AF occurs in the atria. The electrical impulse normally originates at the SA node. However, in atrial fibrillation, many electrical impulses are fired rapidly and at random throughout the atria down to the ventricles. The resulting heartbeat is irregular and usually fast. When the atria are beating rapidly and irregularly (fibrillating) they are unable to completely empty all of the blood they receive into the ventricles. This can cause blood clots to form. Therefore, to prevent you being at an increased risk of stroke you will be treated with an anticoagulant (blood thinner). Atrial flutter Atrial flutter also occurs in the atria. The electrical impulses fire rapidly but the resulting rhythm is regular and organised. The rhythm is due to a re-entry circuit within the atria, where the electrical impulse travels in circles leaving and arriving back at the same point. Ventricular tachycardia (VT) VT occurs when the electrical impulses arise in the ventricles. The ventricles start beating at an abnormally fast, irregular rate. When the ventricles are beating rapidly the heart does not work as efficiently, causing symptoms of weakness, dizziness, chest pain, shortness of breath or even collapse. There are several different types of VT and the seriousness of the condition can vary. VT can be a potentially life-threatening heart rhythm as it can progress to ventricular fibrillation and cause the heart to stop beating (cardiac arrest). There are a number of reasons that people may develop VT. For example, in people who have had a previous myocardial infarction (heart attack) the area of the heart muscle damaged by the heart attack forms scar tissue. This can make the heart susceptible to abnormal heart rhythms. Other people who may experience VT are patients with cardiomyopathy, previous corrective congenital heart surgery or inherited arrhythmias. There is also a small group of people who have VT with a structurally normal heart. Ventricular fibrillation Ventricular fibrillation occurs in the ventricles. In ventricular fibrillation, the electrical impulses are fired from multiple sites in the ventricles in a very fast and irregular way, causing the heart to quiver rather than to beat and pump blood. Ventricular fibrillation is a life-threatening emergency requiring urgent medical treatment. Treatments The results of the tests you have had will determine the type and seriousness of your arrhythmia. Your doctor will then discuss your treatment options with you. Many patients with arrhythmias require no further treatment. www.uhs.nhs.uk Patient information factsheet Medicines There are a number of drugs that can be used to treat arrhythmias. Anti-arrhythmic drugs are medicines that change the electrical signals in your heart and help prevent irregular or rapid heart rhythms. Permanent pacemaker If you have atrial fibrillation which has proved difficult to treat, your doctor may recommend you have a pacemaker fitted in conjunction with a procedure called an atrioventricular (AV) node ablation. A pacemaker is a small device used to treat slow heart rhythms. It is implanted beneath the skin below the collarbone and connected to a pacing wire placed inside the heart. The pacemaker delivers a small electrical impulse to stimulate the heart to beat when it is going too slowly. An AV node ablation and permanent pacemaker insertion will regulate the heart rate and provide relief from your symptoms.
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